Centering or marking tool.



' 0. L. ALBERTSON. GENTERING 0B. MARKING TOOL. APPLICATION FILED AUG. 1B, 1908.

912,052, Patented Feb. 9, 1909.

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lw lun 'l 'l a g/ Jr 9.835 34mun-p ORLANDO LEE ALBERTSON, OF RICHMOND, VIRGINIA.

CENTERING 0R MARKING- TOOL.

Specification of Letters Patent.

Patented Feb. 9, 1909.

Application filed: August 18,1908. Serial No. 449,174.

To all whom it may concem:

Be it known that I; ORLANDO LEE ALBERT- SON, a citizen of the United States, residing at Richmond, in the county of Henrico and State of Virginia, have invented new and useful Improvements in Centering or Marking Tools, of which the following is a specification. Y

This invention relates to a centering or marking tool for the use of wood turners, machinists, die makers, boiler makers, carpenters and other mechanics for ascertaining and marking the center of a shaft or other object of circular or other form, for marking an object parallel with an edge thereofto facilitate the scribing of a line at a desired distance from the ed e, and for various other uses, the object 0 theflinvention being to provide a simple, inexpensive, reliable and eflicient device of this character whereby the above stated and other operations may be readily and conveniently performed.

The invention consists of the features of construction, combination and arrangement of parts hereinafter fully described and clalmed, reference being had to the accompanying drawing, in which Figure 1 is atop plan view of a centering or marking tool embodying my invention. Fig. 2 is a sectional side'elevation of the same. Fig. 3 is a'bottom plan view of the tool. Fig. 4 is a vertical transverse section through the scale bars of the frame of the tool and the marking device.

The frame of the tool comprises a stock or abutting member 1, which is of V-forin and has its working edges 2 disposed at an angle of 45 to the center line of the tool, said stock or abutting member being rabbeted or recessed above its working edges, as indicated at 3, for a purpose hereinafter described: Secured in any suitable manner to the upper faces of the angular arms of the stock are parallel blades 4 and 5. which pro ject outwardly in parallel relation and are connected at their outer or free ends by a' cross bar 6 projecting above the top surfaces of the blades and provided with a downwardly and outwardly beveled or inclined engagin face 7. The upper surface of the blade 4 is provided with suitably designated lines of graduation formin a scale 8 which extends outwardly from the inner end of said blade, or the end secured to the stock 1, while the opposite or lower surface of said blade is provided with suitably designated lines of graduation forming scale 9 which extends toward the stock from the outer or free end of said blade. These scales 8 and 9 are in the respective relative proportions of to 1, and as the member 1 is rightangled, with its sides arranged at an angle of 45 from the line of travel of the punch, the ratio of the scales is that of the cosine of .459 to 1, as will be readily understood. The purpose of the scale 8 is to determine the center of an object whose diameter has been measured through the use of the scale 9. The inner edges of the blades are recessed, rabbeted or beveled to provide inwardly extending guide flanges 10.

. Mounted for sliding movement on the blades is a head 11 comprisin a block of generally rectangular form, said block being ornied in its lateral or side faces with guide grooves 12 receiving said flanges. One of the side faces of the head is beveled and provided with an indicating mark 13 to cooperate with the graduations of the scale 8, while the other side face of the head is provided with a lug 14 having a threaded opening for the passage of a bindin screw 15 adapted to engage the upper surface of the blade 5 to secure the head in any of its adjusted positions. The outer side of the head is formed with a downwardly and inwardly beveled engaging surface 16 for cooperation with the beveled face 7 of the cross bar 6, while the inner face of the head is provided with a correspondingly beveled engaging surface 17 for cooperation with the working edges 2 of the stock or abutting member 1. The lower surface of the head is provided with an indicating mark 13* to cooperate with the scale 9 and which registers with the marking device COIIIPI'lSlIl" a stem 20 provided at its lower end with a conical or taered center punch or marking point 21. he stem normally projects at its upper end above the openup er end of the casingand is provided With a cad 2201f proper form to casing is mounted for vertical movement a be struck by hammer orlike tool for the] ful for the performance of a variety oft purppse of forcin the punchdownward to mar the object. he upper end of the bore of the casing is counterbored or enlarged, as at 23, for the reception of a coiled retracting sprin 24; surroundin the upper end of the stem etween the hea 22 and a shoulder 25 formed at the point of intersection of the bore and counterl I re. This spring holds the stem normally/elevated with the punch point 21- inclosed within and lying above the lower end of the casing and automatically returns the marking deviceto normal position after depression. The. stem is ormed with a reduced ortion 26 and upper and lower contact shoul ers 28 and 29 for cooperation with a stop tending into the casing thrdugh one side thereof. The reduced portion 26 provides an intervening space for the reception of the inner end of the pin or screw to enable the stem to move to the limits of its upward and downward strokes without interference from the screw, which is enga ed at the ends of such strokes by the'shoul ers 29 and 28, the shoulder 29 operating when in engagement with the screw to prevent the stem from being elevated to too great an extent by the spring'24c. In employing the devicefor ascertaining the diameter and center of a shaft or other object of cylindrical or other form, the set screw 15 is loosened to free the head 11 for adjustment and the tool is then placed with the scale 8 facing downward and the scale 9 facing upward over the end of the shaft or surface of the object against one side of which the engaging surface 7 of the cross bar 6 isbrought to bear. The head 11 is then adjusted until its cotiperating surface 16 bearsv against the opposite side of the shaft or object, when the set screw 15 is tightened and the indicating mark 13 inspected in connection with the graduation with whichit registers on the scale 9, by

which the width or diameter in inches or fractions-thereof will be determined The set screw is then loosened again to free the head and the tool inverted so that the point end of the punching stem faces downwardly and the stock 1 is brought to bear against one side of the shaft or object, while the head 11 is adjusted'until its indicating mark 13 registers with the graduation on the scale 8 which corresponds with the graduation on the scale 9 with which the mark. 13 has previously registered, whereupon the point of the marking device will lie immediately above the center of the shaft or object, so that upon striking the head 22 with a hammer or other suitable tool the point 21 will be'fo'rceddown to form the center mark. In like manner vthe diameter and axial center of various forms of'objects may be determined and marked, renderingthe tool use pin or screw 30 6X determining the cent-er of a shaftor other object provided with a bur or projection: The bur or projection will be accommodated between the engaging surfaces in such man nor as to enable the projecting points of the, surfaces to come in contact w th the body of the shaft or object for a true measurement. 1 1 i Having thus fully described the what is claimed as new is 1. A device of the character described comprising a frame having upper and lower engaging members at its opposite ends and provided on its reverse faces with scales invention,

ranged for respective coiiperation with said engaging members, a slide mounted for movement .on the "frame between the engaging faces and having its upper and lower surfaces provided with indicating means to coiiperate with the respective scales, and a marking tool carriedby the slide.

'2. A device of the character described comprising a frame having upper and lower engaging members at the opposite ends thereof and provided onits reverse faces with scales between and arranged, for re spective .cobperation with saidengaging members, a slide mounted for movement on the frame between the engaging members and having cotiperating engaging faces and provided on its upper and lower surfaces with indicating means'for coaction with the, respective scales, and a marking tool carried by the slide.

3. A device of the character. described comprising a frame having engaging members at its opposite ends and provided with and head ilis to adapt these parts for of fective use in measuring the diameter and scales for respective coiiperation with said engaging members, an engaging slide mounted for movement on the frame between the engaging faces and provided with indicating marks to cooperate with the respective scales, and a marking toolcarried by, the slide.

In testimony whereof I aflix my signature in presence of two witnesses.

ORLANDO L TE ALBERTSON.

"Witnesses L. D. Ghana, D. Bownivs. 

